Postfix

Virtual

http://www.postfix.org/VIRTUAL_README.html

postmap /etc/postfix/virtual
postconf -n | grep virtual
/etc/init.d/postfix reload
#OR
service postfix reload

/etc/postfix/virtual

@example.com info@example.net team@example.net ##forward catch all to two addresses
info@example.info example@example.example

After changing execute:

postmap /etc/postfix/virtual

/etc/postfix/virtual_alias_domains

cat /etc/postfix/virtual_alias_domains
example.info
example.com
example.net
example.org

Address

cat /etc/postfix/vi main.cf.new

myhostname = tango.info
mydestination = localhost, $myhostname
myorigin = /etc/mailname

cat /etc/postfix/main.cf
myorigin = /etc/mailname
mydomain = tango.info
myhostname = tango.info

/etc/postfix/main.cf

cat /etc/postfix/main.cf (partial):

myorigin = /etc/mailname
mydomain = example.info
myhostname = example.info
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
virtual_alias_domains=/etc/postfix/virtual_alias_domains
virtual_alias_maps=hash:/etc/postfix/virtual

/etc/mailname

cat /etc/mailname
example.info

OLD:

tango.info (CHANGE to anna.info - some email will now have 
 smtp.mailfrom=xxx@anna.info
 Return-Path: <xxx@anna.info>
 From: xxx <xxx@anna.info>
 but message ID still 1234567890@tango.info
 )

mydomain

cat /etc/postfix/main.cf
myorigin = /etc/mailname
mydomain = example.info
myhostname = example.info

OLD:

mydomain = tango.info
myhostname = tango.info

CHANGE to anna.info - no influence?

myhostname

CHANGE to example.info - message-ID now 12345789@example.info

Forwarding

• http://www.binarytides.com/postfix-mail-forwarding-debian/

TLS

https://bettercrypto.org/#_postfix

master.cf
submission inet n       -       -       -       -       smtpd
   -o smtpd_tls_security_level=encrypt
   -o tls_preempt_cipherlist=yes

after that STARTTLS fails?

dh_4096.pem

openssl dhparam -out /etc/postfix/dh4096.pem -2 4096

main.cf
smtpd_tls_dh1024_param_file = /etc/postfix/dh4096.pem